A new layered Ca–succinate coordination polymer

A new layered Ca–succinate coordination polymer, poly[μ₃-succinato-calcium(II)], [Ca(C₄H₅O₄)]_n, was synthesized by reaction of CaCl₂·2H₂O and succinic acid in an aqueous medium under hydro­thermal microwave conditions. The structure contains infinite layers of edge-sharing calcium penta­gonal–bipyramidal polyhedra forming six-membered rings connected through succinate ligands. Such an assembly of inorganic building units is unique for calcium metal–organic framework-type structures. Adjacent layers are packed into a final pseudo-three-dimensional structure through weak C—H...O hydrogen bonds.